ap07_chemistry_form_b_sgs_final_complete

B chlorine gas an oxidizing agent is bubbled into a

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Unformatted text preview: eaction. Explain your reasoning. The algebraic sign of ΔS ° for the reaction will be positive because one mole of solid (with relatively low entropy) is converted into four moles of gas (with much greater entropy). One point is earned for the correct answer. (b) Chlorine gas, an oxidizing agent, is bubbled into a solution of potassium bromide. (i) Balanced equation: Cl2 + 2 Br − → 2 Cl − + Br2 One point is earned for correct reactants. Two points are earned for correct products. One point is earned for balancing mass and charge. (ii) What is the oxidation number of chlorine before the reaction occurs? What is the oxidation number of chlorine after the reaction occurs? The oxidation number of chlorine is 0 before the reaction and −1 after the reaction. One point is earned for the correct answer. (c) A small piece of sodium is placed in a beaker of distilled water. (i) Balanced equation: 2 Na + 2 H2O → H2 + 2 Na+ + 2 OH− One point is earned for correct reactants. Two points are earned for correct...
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This note was uploaded on 10/01/2009 for the course OC 9876 taught by Professor Dq during the Spring '09 term at UC Merced.

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